638103307 has 2 divisors, whose sum is σ = 638103308. Its totient is φ = 638103306.

The previous prime is 638103299. The next prime is 638103379. The reversal of 638103307 is 703301836.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638103307 - 2³ = 638103299 is a prime.

It is not a weakly prime, because it can be changed into another prime (638104307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319051653 + 319051654.

It is an arithmetic number, because the mean of its divisors is an integer number (319051654).

Almost surely, 2^638103307 is an apocalyptic number.

638103307 is a deficient number, since it is larger than the sum of its proper divisors (1).

638103307 is an equidigital number, since it uses as much as digits as its factorization.

638103307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 638103307 is about 25260.7067795024. The cubic root of 638103307 is about 860.9217208977.

The spelling of 638103307 in words is "six hundred thirty-eight million, one hundred three thousand, three hundred seven".